The application belongs to the technical field of three-dimensional weaving based on RTM process, and particularly relates to a folding strut lower strut design method based on carbon
fiber three-dimensional weaving technology. The method comprises the following steps: determining the design requirements of the folding strut lower strut of the carbon
fiber three-dimensional weaving technology, designing a folding strut lower strut scheme according to the design requirements; taking the outer curved surface of the folding strut lower strut as a reference, constructing a folding strut lower strut finite
element model according to the folding strut lower strut scheme, and obtaining the lower strut load and constraint according to the folding strut mechanism form; performing structure regularization on the folding strut lower strut finite
element model; performing three-dimensional weaving design according to the folding strut lower strut finite
element model to obtain a preformed carbon
fiber three-dimensional woven lower strut; integrally forming the preformed carbon fiber three-dimensional woven lower strut through the RTM process to obtain a carbon fiber three-dimensional woven lower strut product; and checking the carbon fiber three-dimensional woven lower strut product according to the lower strut load and constraint.